Module org.tentackle.sql

Package org.tentackle.sql.backends

Class Oracle8

java.lang.Object

org.tentackle.sql.backends.AbstractBackend

org.tentackle.sql.backends.AbstractSql92Backend

org.tentackle.sql.backends.AbstractSql2003Backend

org.tentackle.sql.backends.Oracle8

All Implemented Interfaces:

Backend

Direct Known Subclasses:

Oracle

@Service(Backend.class)
public class Oracle8
extends AbstractSql2003Backend

Backend for older Oracle versions 8 to 11.
Requires a URL with type postfix "|Oracle8".

Author:

harald

Field Summary

Fields

Modifier and Type	Field	Description
static final String	SQL_NESTED_SELECT_1	window function part 1.
static final String	SQL_NESTED_SELECT_2	window function part 2.
static final String	SQL_NESTED_SELECT_LIMIT	condition for limit and offset.
static final String	SQL_NESTED_SELECT_OFFSET	condition for limit and offset.
static final String	SQL_NESTED_SELECT_ROWNUM	condition for limit and offset.

Fields inherited from class org.tentackle.sql.backends.AbstractSql2003Backend

RESERVED_WORDS_SQL2003, SQL_WINDOW_1, SQL_WINDOW_2, SQL_WINDOW_LIMIT, SQL_WINDOW_OFFSET

Fields inherited from class org.tentackle.sql.backends.AbstractSql92Backend

RESERVED_WORDS_SQL92, SQL_COALESCE, SQL_FOR_UPDATE

Fields inherited from class org.tentackle.sql.backends.AbstractBackend

TYPE_BIGINT, TYPE_BIT, TYPE_BLOB, TYPE_BOOL, TYPE_BOOLEAN, TYPE_BYTE, TYPE_BYTEA, TYPE_CHAR_1, TYPE_CLOB, TYPE_DATE, TYPE_DATETIME, TYPE_DATETIME_YEAR_TO_SECOND, TYPE_DECIMAL, TYPE_DECIMAL_19, TYPE_DOUBLE, TYPE_DOUBLE_PRECISION, TYPE_FLOAT, TYPE_FLOAT4, TYPE_FLOAT8, TYPE_INT, TYPE_INT2, TYPE_INT4, TYPE_INT8, TYPE_INTEGER, TYPE_NCHAR_1, TYPE_NUMBER, TYPE_NUMBER_1, TYPE_NUMBER_10, TYPE_NUMBER_19, TYPE_NUMBER_5, TYPE_NVARCHAR, TYPE_NVARCHAR_MAX, TYPE_REAL, TYPE_SMALLFLOAT, TYPE_SMALLINT, TYPE_TEXT, TYPE_TIME, TYPE_TIMESTAMP, TYPE_TINYINT, TYPE_UUID, TYPE_VARBINARY_MAX, TYPE_VARCHAR

Fields inherited from interface org.tentackle.sql.Backend

SQL_ALLSTAR, SQL_ALTER_COLUMN, SQL_ALTER_INDEX, SQL_ALTER_TABLE, SQL_AND, SQL_ANDNOT, SQL_ARRAY_ALL, SQL_ARRAY_ALL_PAR, SQL_ARRAY_ANY, SQL_ARRAY_ANY_PAR, SQL_ARRAY_IN, SQL_ARRAY_IN_PAR, SQL_ARRAY_NOT_IN, SQL_ARRAY_NOT_IN_PAR, SQL_ARRAY_PAR, SQL_COMMA, SQL_COMMA_PAR, SQL_DELETE, SQL_DOT_STAR, SQL_EQUAL, SQL_EQUAL_PAR, SQL_EQUAL_PAR_COMMA, SQL_EQUAL_ZERO, SQL_EXISTS, SQL_FROM, SQL_GREATER, SQL_GREATER_PAR, SQL_GREATEROREQUAL, SQL_GREATEROREQUAL_PAR, SQL_GROUPBY, SQL_IF_EXISTS, SQL_INSERT_INTO, SQL_INSERT_VALUES, SQL_ISNOTNULL, SQL_ISNULL, SQL_LEFT_PARENTHESIS, SQL_LESS, SQL_LESS_PAR, SQL_LESSOREQUAL, SQL_LESSOREQUAL_PAR, SQL_LIKE, SQL_LIKE_PAR, SQL_MAX, SQL_MIN, SQL_NOT, SQL_NOTEQUAL, SQL_NOTEQUAL_PAR, SQL_NOTEQUAL_ZERO, SQL_NOTLIKE, SQL_NOTLIKE_PAR, SQL_OR, SQL_ORDERBY, SQL_ORNOT, SQL_PAR, SQL_PAR_COMMA, SQL_PLUS_ONE, SQL_RIGHT_PARENTHESIS, SQL_SELECT, SQL_SELECT_ALL_FROM, SQL_SET, SQL_SORTASC, SQL_SORTDESC, SQL_UPDATE, SQL_WHERE, SQL_WHEREALL, SQL_WHEREAND, SQL_WHERENOTHING, SQL_WHEREOR

Constructor Summary

Constructors

Constructor	Description
Oracle8()	Creates the backend for Oracle 8.

Method Summary

Modifier and Type	Method	Description
void	assertValidName(SqlNameType nameType, String name)	Asserts that given string is a valid name and usage.
void	buildSelectSql(StringBuilder sqlBuilder, boolean writeLock, int limit, int offset)	Creates a select statement string from an inner sql string.
String	columnTypeNullDefaultToString(String columnName, SqlType sqlType, int size, int scale, boolean nullable, Object defaultValue)	Converts an sqltype, size, scale, nullable and default value to a database type declaration.
ColumnMetaData	createColumnMetaData(TableMetaData tableMetaData)	Creates a column meta data instance.
Connection	createConnection(String url, String username, char[] password)	Creates a jdbc connection.
static String	dateString(Date date)	Converts a date to a string.
protected String	extractWhereClause(String sql, int whereOffset)	Extracts the where clause from a given sql.
String	getBackendId(Connection connection)	Determines the unique id or name used by the backend for a given connection.
String	getDriverClassName()	Gets the JDBC driver class name.
String	getEmptyString()	Gets the empty string. Some dbms (most famous: Oracle) handle empty strings as null.
int	getMaxSize(SqlType sqlType)	Returns the maximum size for a given SQL-type.
String	getName()	Gets the name of the backend.
boolean	isDeprecated()	Returns whether this backend is deprecated and superseded by a newer implementation. Deprecated backends are omitted from BackendFactory.getAllBackends().
boolean	isExtraCommitRequired()	According to the JDBC-specs Connection.setAutoCommit(boolean)(true) should commit, but some backends require an extra Connection.commit().
boolean	isMatchingUrl(String url)	Checks whether the backend belongs to the given jdbc url. If multiple backend implementations are provided for the same database type, only one backend should match the URL.
boolean	isReservedSchemaName(String name)	Checks whether this is a reserved schema name for this backend.
boolean	isReservedTableName(String name)	Checks whether this a reserved table name for this backend. Applies only to tables.
boolean	isSchemaSupported()	Returns whether the backend supports schemas.
boolean	isTemporaryName(String name)	Checks whether this is a temporary name. Returns whether an entity-, attribute- or index-name is temporary and should not be taken into account for migration or even used in the model. Depending on the backend, temporary names start with an underscore or some other lead string.
boolean	isTransientTransactionException(SQLException ex)	Determines whether exception is transient and retrying the transaction may succeed. Typical transient exceptions are thrown when a deadlock is detected or when serialized transaction isolation is used.
SqlType[]	jdbcTypeToSqlType(int jdbcType, int size, int scale)	Converts the JDBC data type integer to a tentackle backend SqlTypes.
String	sqlAddColumn(String tableName, String columnName, String comment, SqlType sqlType, int size, int scale, boolean nullable, Object defaultValue)	Generates sql code to add a column.
String	sqlAlterColumnDefault(String tableName, String columnName, SqlType sqlType, Object defaultValue)	Generates sql code to change the default value a column.
String	sqlAlterColumnNullConstraint(String tableName, String columnName, boolean nullable)	Generates sql code to change the null-constraint of a column.
String	sqlAlterColumnType(String tableName, String columnName, String comment, SqlType sqlType, int size, int scale, boolean nullable, Object defaultValue)	Generates sql code to change the datatype of a column.
String	sqlCreateColumnComment(String tableName, String columnName, String comment)	Generates SQL code to create the comment for an attribute.
String	sqlCreateTableComment(String tableName, String comment)	Generates SQL code to create the comment for a table.
String	sqlNextFromSequence(String name)	Creates the SQL string to retrieve the next id from a sequence.
String	sqlRenameTable(String tableName, String newTableName)	Generate sql code to rename a table.
String	sqlTypeToString(SqlType sqlType, int size)	Converts the java SQL-type to the database type name.
static String	timestampString(Timestamp timestamp)	Converts a timestamp to a string.
static String	timeString(Time time)	Converts a time to a string.
String	valueToLiteral(SqlType sqlType, Object value)	Converts a type and value to a literal string.

Methods inherited from class org.tentackle.sql.backends.AbstractSql2003Backend

getReservedWords, isSequenceSupported, setLeadingSelectParameters, setTrailingSelectParameters, sqlCreateSequence

Methods inherited from class org.tentackle.sql.backends.AbstractSql92Backend

getCoalesceKeyword, isLeadingSelectMissing, sqlCreateForeignKey, sqlCreateSequenceComment, sqlDropForeignKey

Methods inherited from class org.tentackle.sql.backends.AbstractBackend

buildSelectSql, columnTypeToString, createIndexColumnMetaData, createIndexMetaData, createPassword, createScriptRunner, createTableMetaData, getBlockCommentBegin, getBlockCommentBegins, getBlockCommentEnd, getBlockCommentEnds, getDefaultSchema, getDefaultSize, getMaxScale, getMetaData, getMigrationStrategy, getModelMetaData, getSingleLineComment, getSingleLineComments, getStatementSeparator, getStatementSeparators, getTableHeaders, getTableMetaData, isAliasRequiredForSubSelect, isArrayOperatorSupported, isClobSupported, isCommunicationLinkException, isConstraintException, isDatabaseInMemory, isDefaultEqual, isDropIfExistsEnabled, isDropIfExistsSupported, isExceptionErrorCodeMatching, isExceptionStateMatching, isExceptionStateStartingWith, isExpressionReferringToTableBeingUpdatedSupported, isFilteredIndexSupported, isFunctionBasedIndexSupported, isMatchingName, isPosixEscapeSyntaxSupported, isReleaseSavepointSupported, isReservedWord, isTxRequiredForFetchsize, isUUIDSupported, normalizeDefault, optimizeSql, setArray, setDropIfExistsEnabled, sqlAlterColumnComment, sqlAlterTableComment, sqlAsBeforeTableAlias, sqlComment, sqlCreateColumn, sqlCreateIndex, sqlCreateSchema, sqlCreateTableAttributeWithoutComment, sqlCreateTableClosing, sqlCreateTableIntro, sqlCreateTableIntroWithoutComment, sqlDropColumn, sqlDropIndex, sqlDropTable, sqlFunction, sqlJoin, sqlJoinSelects, sqlJoinSelects, sqlRenameAndAlterColumnType, sqlRenameColumn, sqlRenameIndex, sqlUpdateToNotNull, toInternalType, toQuotedString, toString, validateVersion

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

SQL_NESTED_SELECT_1

public static final String SQL_NESTED_SELECT_1

window function part 1.

See Also:

• Constant Field Values

SQL_NESTED_SELECT_2

public static final String SQL_NESTED_SELECT_2

window function part 2.

See Also:

• Constant Field Values

SQL_NESTED_SELECT_ROWNUM

public static final String SQL_NESTED_SELECT_ROWNUM

condition for limit and offset.

See Also:

• Constant Field Values

SQL_NESTED_SELECT_LIMIT

public static final String SQL_NESTED_SELECT_LIMIT

condition for limit and offset.

See Also:

• Constant Field Values

SQL_NESTED_SELECT_OFFSET

public static final String SQL_NESTED_SELECT_OFFSET

condition for limit and offset.

See Also:

• Constant Field Values

Constructor Details

Oracle8

public Oracle8()

Creates the backend for Oracle 8.

Method Details

dateString

public static String dateString(Date date)

Converts a date to a string.

Parameters:

date - the date

Returns:

a TO_DATE-date-string

timeString

public static String timeString(Time time)

Converts a time to a string.

Parameters:

time - the time

Returns:

a TO_DATE-time-string

timestampString

public static String timestampString(Timestamp timestamp)

Converts a timestamp to a string.

Parameters:

timestamp - the timestamp

Returns:

a TO_DATE-timestamp-string

isDeprecated

public boolean isDeprecated()

Description copied from interface: Backend

Returns whether this backend is deprecated and superseded by a newer implementation.
Deprecated backends are omitted from BackendFactory.getAllBackends().

Specified by:

isDeprecated in interface Backend

Overrides:

isDeprecated in class AbstractBackend

Returns:

true if deprecated

getDriverClassName

public String getDriverClassName()

Description copied from interface: Backend

Gets the JDBC driver class name.

Returns:

the class name

createConnection

public Connection createConnection(String url,
 String username,
 char[] password)
                            throws SQLException

Description copied from interface: Backend

Creates a jdbc connection.

Specified by:

createConnection in interface Backend

Overrides:

createConnection in class AbstractBackend

Parameters:

url - the jdbc url

username - the username

password - the password

Returns:

the created connection

Throws:

SQLException - if connection could not be established

isMatchingUrl

public boolean isMatchingUrl(String url)

Description copied from interface: Backend

Checks whether the backend belongs to the given jdbc url.
If multiple backend implementations are provided for the same database type, only one backend should match the URL. The others must be selected via name.

Parameters:

url - the jdbc url

Returns:

true if matches

getName

public String getName()

Description copied from interface: Backend

Gets the name of the backend.

Returns:

the name

getBackendId

public String getBackendId(Connection connection)

Description copied from interface: Backend

Determines the unique id or name used by the backend for a given connection.

Useful to figure out the corresponding ManagedConnection from the backend's logfiles.

Parameters:

connection - the jdbc connection

Returns:

the backend id, null if none

isSchemaSupported

public boolean isSchemaSupported()

Description copied from interface: Backend

Returns whether the backend supports schemas.

Specified by:

isSchemaSupported in interface Backend

Overrides:

isSchemaSupported in class AbstractBackend

Returns:

true if supported

See Also:

• Backend.sqlCreateSchema(String)

isTemporaryName

public boolean isTemporaryName(String name)

Description copied from interface: Backend

Checks whether this is a temporary name.
Returns whether an entity-, attribute- or index-name is temporary and should not be taken into account for migration or even used in the model.
Depending on the backend, temporary names start with an underscore or some other lead string.

Specified by:

isTemporaryName in interface Backend

Overrides:

isTemporaryName in class AbstractBackend

Parameters:

name - the name

Returns:

true temporary (invalid) name

isReservedTableName

public boolean isReservedTableName(String name)

Description copied from interface: Backend

Checks whether this a reserved table name for this backend.
Applies only to tables. Not to be mixed up with Backend.getReservedWords().
Useful to avoid conflicts with naming conventions for backend specific things, such as snapshots.

Specified by:

isReservedTableName in interface Backend

Overrides:

isReservedTableName in class AbstractBackend

Parameters:

name - the table name

Returns:

true if reserved by backend

isReservedSchemaName

public boolean isReservedSchemaName(String name)

Description copied from interface: Backend

Checks whether this is a reserved schema name for this backend.

Specified by:

isReservedSchemaName in interface Backend

Overrides:

isReservedSchemaName in class AbstractBackend

Parameters:

name - the schema name

Returns:

true if reserved by backend

assertValidName

public void assertValidName(SqlNameType nameType,
 String name)

Description copied from interface: Backend

Asserts that given string is a valid name and usage.

Specified by:

assertValidName in interface Backend

Overrides:

assertValidName in class AbstractBackend

Parameters:

nameType - the type/usage of the name

name - the name

isTransientTransactionException

public boolean isTransientTransactionException(SQLException ex)

Description copied from interface: Backend

Determines whether exception is transient and retrying the transaction may succeed.
Typical transient exceptions are thrown when a deadlock is detected or when serialized transaction isolation is used.

Other transient errors are not covered by this method (e.g. connection timeouts, etc...).

Specified by:

isTransientTransactionException in interface Backend

Overrides:

isTransientTransactionException in class AbstractBackend

Parameters:

ex - the exception

Returns:

true if retrying the transaction may succeed

getEmptyString

public String getEmptyString()

Description copied from interface: Backend

Gets the empty string.
Some dbms (most famous: Oracle) handle empty strings as null. In such cases the empty string (e.g. Oracle) may consist of a single blank, or whatever.

Specified by:

getEmptyString in interface Backend

Overrides:

getEmptyString in class AbstractBackend

Returns:

the empty string (never null)

columnTypeNullDefaultToString

public String columnTypeNullDefaultToString(String columnName,
 SqlType sqlType,
 int size,
 int scale,
 boolean nullable,
 Object defaultValue)

Description copied from interface: Backend

Converts an sqltype, size, scale, nullable and default value to a database type declaration.

Specified by:

columnTypeNullDefaultToString in interface Backend

Overrides:

columnTypeNullDefaultToString in class AbstractBackend

Parameters:

columnName - the database column name

sqlType - the JDBC sql type

size - the optional size

scale - the optional scale

nullable - true if NULL, else NOT NULL

defaultValue - the optional default value

Returns:

the SQL code

valueToLiteral

public String valueToLiteral(SqlType sqlType,
 Object value)

Description copied from interface: Backend

Converts a type and value to a literal string.

Specified by:

valueToLiteral in interface Backend

Overrides:

valueToLiteral in class AbstractBackend

Parameters:

sqlType - the sql type

value - the value

Returns:

the constant

createColumnMetaData

public ColumnMetaData createColumnMetaData(TableMetaData tableMetaData)

Description copied from interface: Backend

Creates a column meta data instance.

Specified by:

createColumnMetaData in interface Backend

Overrides:

createColumnMetaData in class AbstractBackend

Parameters:

tableMetaData - the table metadata this column belongs to

Returns:

the meta data

isExtraCommitRequired

public boolean isExtraCommitRequired()

Description copied from interface: Backend

According to the JDBC-specs Connection.setAutoCommit(boolean)(true) should commit, but some backends require an extra Connection.commit().

Specified by:

isExtraCommitRequired in interface Backend

Overrides:

isExtraCommitRequired in class AbstractBackend

Returns:

true if the database needs an extra commit

buildSelectSql

public void buildSelectSql(StringBuilder sqlBuilder,
 boolean writeLock,
 int limit,
 int offset)

Description copied from interface: Backend

Creates a select statement string from an inner sql string.

sqlBuilder is anything as [SELECT] FROM... WHERE... ORDER BY....
It is decorated with a leading SELECT, if missing, plus optional clauses like for the given parameters.

Specified by:

buildSelectSql in interface Backend

Overrides:

buildSelectSql in class AbstractSql2003Backend

Parameters:

sqlBuilder - the sql builder, initially containing the inner sql without leading SELECT.

writeLock - true select should write lock

limit - the limit value, ≤ 0 if no limit clause

offset - the offset value, ≤ 0 if no offset clause

getMaxSize

public int getMaxSize(SqlType sqlType)

Description copied from interface: Backend

Returns the maximum size for a given SQL-type.

Specified by:

getMaxSize in interface Backend

Overrides:

getMaxSize in class AbstractBackend

Parameters:

sqlType - the SQL-type

Returns:

the maximum size, 0 if unlimited, -1 if type without size

sqlTypeToString

public String sqlTypeToString(SqlType sqlType,
 int size)

Description copied from interface: Backend

Converts the java SQL-type to the database type name.

Specified by:

sqlTypeToString in interface Backend

Overrides:

sqlTypeToString in class AbstractBackend

Parameters:

sqlType - the java sql type

size - the column's size

Returns:

the corresponding type string

jdbcTypeToSqlType

public SqlType[] jdbcTypeToSqlType(int jdbcType,
 int size,
 int scale)

Description copied from interface: Backend

Converts the JDBC data type integer to a tentackle backend SqlTypes.

There may be more than one sqltype returned!

Specified by:

jdbcTypeToSqlType in interface Backend

Overrides:

jdbcTypeToSqlType in class AbstractBackend

Parameters:

jdbcType - the jdbc data type

size - the column size

scale - the column's scale

Returns:

the SqlTypes, empty array if no mapping available or no exact match (not generated by TT)

See Also:

• Types

sqlNextFromSequence

public String sqlNextFromSequence(String name)

Description copied from interface: Backend

Creates the SQL string to retrieve the next id from a sequence.

Specified by:

sqlNextFromSequence in interface Backend

Overrides:

sqlNextFromSequence in class AbstractSql2003Backend

Parameters:

name - the name of the sequence

Returns:

the SQL code

sqlRenameTable

public String sqlRenameTable(String tableName,
 String newTableName)

Description copied from interface: Backend

Generate sql code to rename a table.

Specified by:

sqlRenameTable in interface Backend

Overrides:

sqlRenameTable in class AbstractBackend

Parameters:

tableName - the old tablename (with leading schema, if any)

newTableName - the new tablename (without schema)

Returns:

the SQL code

sqlCreateTableComment

public String sqlCreateTableComment(String tableName,
 String comment)

Description copied from interface: Backend

Generates SQL code to create the comment for a table.

Specified by:

sqlCreateTableComment in interface Backend

Overrides:

sqlCreateTableComment in class AbstractBackend

Parameters:

tableName - the table name

comment - optional comment, null if none

Returns:

the SQL code, empty string if comment is created via Backend.sqlCreateTableIntro(java.lang.String, java.lang.String) or Backend.sqlCreateTableClosing(java.lang.String, java.lang.String)

sqlCreateColumnComment

public String sqlCreateColumnComment(String tableName,
 String columnName,
 String comment)

Description copied from interface: Backend

Generates SQL code to create the comment for an attribute.

Specified by:

sqlCreateColumnComment in interface Backend

Overrides:

sqlCreateColumnComment in class AbstractBackend

Parameters:

tableName - the table name

columnName - the column name

comment - optional comment, null if none

Returns:

the SQL code, empty string if comment is created via Backend.sqlCreateColumn(java.lang.String, java.lang.String, org.tentackle.sql.SqlType, int, int, boolean, java.lang.Object, boolean, boolean)

sqlAddColumn

public String sqlAddColumn(String tableName,
 String columnName,
 String comment,
 SqlType sqlType,
 int size,
 int scale,
 boolean nullable,
 Object defaultValue)

Description copied from interface: Backend

Generates sql code to add a column.

Specified by:

sqlAddColumn in interface Backend

Overrides:

sqlAddColumn in class AbstractBackend

Parameters:

tableName - the tablename

columnName - the new column name

comment - optional comment, null if none

sqlType - the JDBC sql type

size - the optional size

scale - the optional scale

nullable - true if NULL, else NOT NULL

defaultValue - the optional default value

Returns:

the SQL code

sqlAlterColumnNullConstraint

public String sqlAlterColumnNullConstraint(String tableName,
 String columnName,
 boolean nullable)

Description copied from interface: Backend

Generates sql code to change the null-constraint of a column.

Specified by:

sqlAlterColumnNullConstraint in interface Backend

Overrides:

sqlAlterColumnNullConstraint in class AbstractBackend

Parameters:

tableName - the tablename

columnName - the new column name

nullable - true if NULL, else NOT NULL

Returns:

the SQL code, null if need Backend.sqlAlterColumnType(java.lang.String, java.lang.String, java.lang.String, org.tentackle.sql.SqlType, int, int, boolean, java.lang.Object)

sqlAlterColumnType

public String sqlAlterColumnType(String tableName,
 String columnName,
 String comment,
 SqlType sqlType,
 int size,
 int scale,
 boolean nullable,
 Object defaultValue)

Description copied from interface: Backend

Generates sql code to change the datatype of a column.

Specified by:

sqlAlterColumnType in interface Backend

Overrides:

sqlAlterColumnType in class AbstractBackend

Parameters:

tableName - the tablename

columnName - the new column name

comment - optional comment, null if none

sqlType - the JDBC sql type

size - the optional size

scale - the optional scale

nullable - true if NULL, else NOT NULL

defaultValue - the optional default value

Returns:

the SQL code

sqlAlterColumnDefault

public String sqlAlterColumnDefault(String tableName,
 String columnName,
 SqlType sqlType,
 Object defaultValue)

Description copied from interface: Backend

Generates sql code to change the default value a column.

Specified by:

sqlAlterColumnDefault in interface Backend

Overrides:

sqlAlterColumnDefault in class AbstractBackend

Parameters:

tableName - the tablename

columnName - the new column name

sqlType - the JDBC sql type

defaultValue - the optional default value

Returns:

the SQL code, null if need Backend.sqlAlterColumnType(java.lang.String, java.lang.String, java.lang.String, org.tentackle.sql.SqlType, int, int, boolean, java.lang.Object)

extractWhereClause

protected String extractWhereClause(String sql,
 int whereOffset)

Description copied from class: AbstractBackend

Extracts the where clause from a given sql.

Overrides:

extractWhereClause in class AbstractBackend

Parameters:

sql - the sql statement

whereOffset - the location of WHERE in sql

Returns:

the where clause without the keyword WHERE